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You can drop your tables with the DROP TABLE command. Figure 7-18 shows the syntax diagram for the DROP TABLE command.

>javac -g:none -bootclasspath %MIDPClasses%;. EntryForm.java >javac -g:none -bootclasspath %MIDPClasses%;. ObtainQuoteMIDlet.java >javac -g:none -bootclasspath %MIDPClasses%;. RetrieveQuoteMIDlet.java

>%MIDPTools%\preverify -classpath %MIDPClasses%;. ObtainQuoteMIDlet >%MIDPTools%\preverify -classpath %MIDPClasses%;. RetrieveQuoteMIDlet >%MIDPTools%\preverify -classpath %MIDPClasses%;. EntryForm

Figure 7-17. The main Banner Manager screen shows all of the individual banners and their statistical information.

Unless you have specific system privileges, you cannot drop tables owned by other database users. Also, you cannot roll back a DROP TABLE command. As you ve learned in previous chapters, this is true for all DDL statements (CREATE, ALTER, and DROP). Errare humanum est, as the Romans said. Because human errors occur occasionally, Oracle Database 10g introduced the concept of the database recycle bin. By default, all dropped tables (and their dependent objects) initially end up in the recycle bin. You can query the recycle bin using the [USER_]RECYCLEBIN view, as shown in Listing 7-18. To make sure we start with an empty recycle bin, we begin the experiment with a PURGE command. Listing 7-18. Dropping Tables and Querying the Recycle Bin SQL> purge recyclebin; Recyclebin purged. SQL> drop table history; Table dropped. SQL> select object_name, original_name, droptime 2 from recyclebin; OBJECT_NAME -----------------------------BIN$mlRH1je9TBOeVEUhukIpCw==$0 BIN$EETkZCY0RSKCR3BhtF9cJw==$0 SQL> As you can see, the objects are renamed, but the original names are kept as well. There is one entry for the HISTORY table and one entry for the primary key index. You can recover tables (and optionally rename them) from the recycle bin by using the FLASHBACK TABLEcommand: SQL> flashback table history to before drop 2 [rename to <new name>]; Flashback complete. SQL> ORIGINAL_NAME ---------------------H_PK HISTORY DROPTIME ------------------2004-07-01:20:22:23 2004-07-01:20:22:23

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>jar -cfm quote.jar QuoteMIDletSuite.jad -C ./output ObtainQuoteMIDlet.class -C ./output RetrieveQuoteMIDlet.class C ./output EntryForm.class

Caution There is no guarantee the FLASHBACK TABLE command always succeeds. The recycle bin can be purged explicitly (by a database administrator) or implicitly (by the Oracle DBMS).

Figure 7-18. The Configuration window of the Banner Manager lets you change tracking options. You can create a new banner by clicking the New button or edit an existing one by clicking the banner name. You can see by the number of available settings (see Figure 719) that you can set up a banner to display in nearly any way you might want. Note that you can even include custom banner code if some JavaScript interactivity is needed. The actual banner graphics should be located in the \images\banners folder of the installation. You can use the Media Manager or an FTP program to transfer the files into the proper folder. Once there, the filenames will appear in the Banner Image Selector drop-down list.

The JAD file (QuoteMIDletSuite.jad) for this application will look something like the following:

If you want to drop a table and bypass the recycle bin, you can use the PURGE option of the DROP TABLE command, as shown in Figure 7-18. If you drop a table, you implicitly drop certain dependent database objects, such as indexes, triggers, and table privileges granted to other database users. You also invalidate certain other database objects, such as views and packages. Keep this in mind during database reorganizations. To re-create a

MIDlet-1: ObtainQuote, , ObtainQuoteMIDlet MIDlet-2: RetrieveQuote, , RetrieveQuoteMIDlet MIDlet-Name: EasyTrack MIDlet-Vendor: Catapult Technologies MIDlet-Version: 1.0 MicroEdition-Configuration: CLDC-1.0 MicroEdition-Profile: MIDP-1.0

Figure 7-19. Editing the details of a banner allows setting the presentation of the banner, including the image.

table, it is not enough to simply issue a CREATE TABLE command after a DROP TABLE command. You need to reestablish the full environment around the dropped table. If you issue a DROP TABLE command, you may get the following error message if other tables contain foreign key constraints referencing the table that you are trying to drop: ORA-02449: unique/primary keys in table referenced by foreign keys Try to drop the EMPLOYEES table, and see what happens. You can solve this problem by using the CASCADE CONSTRAINTS option, as shown in Figure 7-18. Note, however, that this means that all offending foreign key constraints are dropped, too.

Figure 5.16 This form fulfills the prototype screen design for capturing the customer s investment symbol of interest. It provides the means to enter an investment symbol and investment type in the Investment Quote EntryForm. The form utilizes a TextField and ChoiceGroup object.